Fielding dedicated fighter aircraft was not exactly something anyone had planned for—other than Germany, that is. It was because of this that the Germans pretty much established air supremacy around their own borders.
Opting to ensure their planes detected enemy movements and coordinated attacks with other assets on the ground, such as tanks and armored vehicles, they employed a form of combined arms tactics that the world had not yet truly begun to understand.
The way it normally worked was that German planes acted as either reconnaissance or ground attack craft. They would spot enemy movements and send their positions back to intelligence over the radio.
Meanwhile, a strike would be coordinated on the enemy position in conjunction with artillery, bombers, and any armored reconnaissance assets hiding behind enemy lines that were in a position to strike.